quota warning problem

[Philip Steeman]

Hello,
I have a strange bahaviour of cyrus (imap). My version is the version of 
Debian-stable (version 1.15.19-9.1).
I have the following quota's:
> philip at valencia:~$ cyradm -u cyrus localhost
> localhost password: 
> localhost> lq user.test
> STORAGE 1547/1800 (85%)
> 
> localhost> lq user.realuser
> STORAGE 42767/50000 (85%)
> 

When I make a connection with Outlook with user 'test', I get a quota 
warning (> 80%).
When I make a connection with Outlook with user 'realuser', I get NO 
quota warning.

The only differences between these 2 users I can see:
- smaller quota (integer overflow?)
- the 'realuser' has more mailboxes underneath INBOX

Where should I start to look?

Philip